Combining Greek koronis is the Unicode character at U+0343 in Combining Diacritical Marks. Official name: COMBINING GREEK KORONIS. It marks smooth breathing (psili) and must follow a base letter (for example α + U+0343 → ἀ).
Remember
Character ◌̓ (combining; needs a base letter)
Unicode U+0343
Hex entity ̓
Decimal ̓
CSS escape \0343
Named entity (none)
Meaning Greek koronis / smooth breathing (psili)
Not the same ἀ (precomposed) · U+0313 (comma above) · dialytika tonos
Use ̓ or ̓ after a letter (no named form). For normal polytonic text, prefer precomposed letters such as ἀ (U+1F00).
Built with Hex: ἀ
Built with Decimal: ἀ
Built with CSS (after α): ἀ
Equivalent U+0313: ἀ
Precomposed: ἀ
How It Works
1. Hex: write a base letter, then ̓. Alone, U+0343 has no letter shape.
2. Decimal: same mark as 835 → ̓ after the letter.
3. CSS: use \0343 in content after a letter in the string (here the letter is in the HTML, the mark is appended). Prefer four hex digits so the escape does not swallow the next character.
4. Equivalent:̓ (U+0313) is canonically the same mark for many bases.
5. Precomposed:ἀ (U+1F00) is usually best for normal text. NFC may turn ἀ into ἀ.
Pitfalls & Tips
Common mistakes when working with combining Greek koronis.
Base
Always use a base letter
U+0343 alone is invisible as a letter. Write ἀ, not a bare ̓, when you want a visible glyph.
Prefer
Prefer precomposed Greek
For published text, use Greek Extended letters (ἀ, ἐ, …) instead of stacking combining marks by hand.
NFC
Normalization may rewrite it
α + U+0343 often becomes precomposed ἀ under NFC. Do not assume the code point stays U+0343 after processing.
vs 0313
Canonically same as U+0313
Combining comma above (U+0313) is the canonical equivalent of Greek koronis. Pick one form and stay consistent.
Named?
No named entity
HTML5 does not define a name for U+0343. Use ̓ or ̓.
CSS vs HTML
Do not mix escapes
\0343 belongs in CSS strings. ̓ / ̓ belong in HTML after a base letter.
Semicolon
End references
Always finish entities with ; — write ̓, not ̓.
Compatibility
Browser Support
Combining Greek koronis (U+0343) and its numeric entity forms (̓, ̓, CSS \\0343) are supported in browsers that implement Unicode combining marks. Rendering quality depends on the font’s Greek diacritic support.
✓ Universal entity support
Greek Koronis (ἀ)
Encode with hex, decimal, or CSS escape after a base letter — same code point where combining marks are supported.
100%Entity support
Google ChromeSupported
Yes
Microsoft EdgeSupported
Yes
Mozilla FirefoxSupported
Yes
Apple SafariSupported
Yes
OperaSupported
Yes
Internet ExplorerIE 9+
Yes
U+0343Full support
Bottom line: Prefer precomposed polytonic letters for normal text. Use ̓ / ̓ when you need U+0343 explicitly, and \\0343 only inside CSS content.
Remember
Key Takeaways
Unicode: combining Greek koronis is U+0343 (decimal 835).
HTML: use ̓ or ̓ after a base letter — no named entity.
CSS: use \0343 inside content after a letter in the string.
Prefer: precomposed ἀ (etc.) — U+0343 ≈ U+0313 under NFC.
One line:U+0343 → base + ̓ / ̓ / CSS \0343 (prefer ἀ).
Frequently Asked Questions
Place ̓ (hex) or ̓ (decimal) after a base letter, for example ἀ. There is no named HTML entity for U+0343. You can also use CSS \0343 in content. Prefer precomposed letters such as ἀ when available.
U+0343 (COMBINING GREEK KORONIS). Hex 343, decimal 835. It belongs to Combining Diacritical Marks (U+0300–U+036F).
No. HTML5 does not define a named entity for combining Greek koronis. Prefer ̓ or ̓.
Use it for polytonic Greek smooth breathing (psili) when building letters with combining marks. For everyday text, prefer precomposed Greek Extended letters such as ἀ (U+1F00).
HTML numeric entities (̓ or ̓) go in markup after a base letter. The CSS escape \0343 goes in stylesheet strings (usually content on ::before/::after).
They are canonically equivalent. Unicode NFC treats them the same with many bases. Prefer precomposed Greek letters for normal writing.
🤔
Did you know?
Combining Greek koronis is Unicode U+0343 (decimal 835) in Combining Diacritical Marks — smooth breathing (psili) in polytonic Greek. There is no HTML5 named entity; use ̓ or ̓ after a base letter. It is canonically equivalent to combining comma above (U+0313). NFC may turn ἀ into precomposed ἀ (U+1F00).
